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How to Disable Firefox DNS Cache

This is a discussion on How to Disable Firefox DNS Cache inside About DNS forums : Unlike other popular web browsers, Firefox runs its own DNS cache separate from the client services on your computer. As ...

Unlike other popular web browsers, Firefox runs its own DNS cache separate from the client services on your computer. As a result, if you commonly switch between a VPN, home ISP, or other connections, undesired results may occur if you access services which require use of your VPN, etc. For this reason, when you take actions to fully flush DNS on your computer, FireFox should be closed. If DNS issues persist on your computer and FireFox is your preferred browser, then the answer may lay in disabling DNS Cache in the browser specifically.

1. Enter “about:config” in the location bar followed by pressing the “enter” or “return” key. Right click at a blank location on the subsequently displayed record and select “New” and “Integer.”

7. Enter “network.dnsCacheExpiration” as the preference name with “0” as the integer value. If “network.dnsCacheExpiration” already exists, modify the integer value to “0.” If you want to restore FireFox defaults, simply change the value back to the default of “3600.” With 0 entered, DNS cache in FireFox will automatically expire on your computer.